Some of Hollywood's most successful films, such as The Poseidon Adventure, Titanic, The Abyss and The Perfect Storm have incited audiences' primal fears of the ocean. But could a massive tidal wave really overturn a luxury liner? And with films based on actual events, how did directors stretch their cinematic liberties? Hollywood Science examines the science behind these jaw-dropping images of disasters at sea to reveal what's plausible or impossible.